House's classification (Psychological)
- Class 1: Philosophical
- Accepts dentist's judgement and instructions, best prognosis.
- Class 2: Exacting
- Methodical and demanding, asks a lot of questions, good prognosis.
- Class 3: Hysterical
- Emotionally unfit, never happy, worst prognosis.
- Class 4: Indifferent
- Doesn't care about dental treatment and gives up easily.